Patent GB-191416477-A (GB)
Title: Improvements in Sheet Feeding Machines.
IPC: B65H9/14
Filed: 1913-12-29
Granted: 1914-12-29
Abstract: 16,477. Marks, E. C. R., [Middleditch, L.]. Dec. 29, 1913. Sheet - registering devices; carriers; guides; dropping- roller sheet feeds.-Apparatus for feeding sheets to printing-machines is provided with means to slow down the sheets as they approach the front stops and with a detector which, in case a sheet is not fed, acts to disengage the drive of the feed-apparatus and may also trip the printing-cylinder. As applied to apparatus in which the sheets are fed bv driven rolls 3. and drop rolls 4, Figs. 3 and 7. the sheet is slowed down, after the rolls 4 lift, by rising and falling rolls 120 driven at a less speed than the rolls 3 and arranged just behind the front stops 6, Fig. 10, and in line with side-registering devices of the kind described in Specification 16,478/14. Each roll 120 is carried in an arm 121 loose on, and driven from, a cross-shaft 115<a>, which also drives the sideregistering device, and the arm boss is embraced by a bracket 138 loosely mounted on and adjustable along the shaft 115<a> and shafts 116, 130. The roll is lowered yieldingly on to the sheet and raised, in a path inclined towards the direction of movement of the sheet, by an arm 124 which engages between a stop and a spring on a rod 125 connected to the arm 121, and is secured to the shaft 116, which is rocked by a cam 117, Fig. 7, on the shaft 115<a>. The front stops 6 are carried by a shaft 149 rocked by a bell-crank 151 from a cam 150 on the impression cylinder. The shaft 115<a> is driven through side shafts 209, Fig. 7, which drive the rolls 3 from a shaft which is driven through a clutch, shown in Fig. 9, from the main shaft, and a cam 219 on a shaft in the train of gear rocks an arm 220 to operate the dropping rolls 4. The clutch compresses a disk '250 fixed on a shaft 192 and a loose wheel 191 carrying a pivoted pawl 251 normally engaging a notch in the disk to drive it through one revolution in each cycle of the machine. If a sheet is correctly fed, it supports a feeler 8 carried by an arm 131 on the shaft 130; but if no sheet is present, the feeler 8 descends when the gap 136 in the impression cylinder comes below it, and the hooked tail end of the feeler rises and is engaged by a cam 137 which acts to rock the shaft 130, an arm 272, Fig. 3, thereon then moving a guided bar 270 so that an abutment 269 is carried clear of one arm 268 of a pivoted three-armed lever, another arm 264 of which is connected through a spring-pressed rod 261 with a foot-trip pedal 283. The lever is thereby rocked, and the third arm moves a rod to operate a slide bar 256, Fig. 9, carrying a cam 255, which is brought into the path of a bowl on the pawl 251 and disengages the pawl so as to stop the drive of the feed-apparatus. The feed-trip may also trip the press, for which purpose a cam-reciprocated rod 281, Fig. 3, is connected by a link 282 with a pedal 283, and when the feed-trip is operated, the movement imparted to the pedal shifts the rod into the path of one of two abutments 280 on arms connected to one member 278 of toggle-levers 278, 277 connected with the eccentric bearing of the impression cylinder.